It’s Thanksgiving in Riverdale, and you’re getting an extra helping of crazy on “Chapter Sixty-Four: The Ice Storm.” While Archie deals with the Dickinsons (no relation to Emily) invading his community center, Betty and Jughead are investigating a mystery at Stonewall Prep. Plus, Cheryl and Toni pull a classic Eric Cartman move in Thistlehouse, and FP and Alice finally get to act like a couple.